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Prev Professional Automotive Repair Technical Discussions for November 14, 2005
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Open Help Requests for GM
Help Request Answers
1997 Cadillac DeVille 4.6L fuel leak VIN: 1G6K54Y1VU
customer came in complaning of gasoline smell from car after driving. after inspection I found that fuel was leaking from from the vent for the carbon canister. Ran some test and found the canister purge valve to be at fault according to service manual. Custom...
1994 Chevrolet K1500 Cheyenne 6.5L Stall VIN: 1GBEK19SXR
Intermittent dies mostly when cold, When dies, signal remains from Crank sensor and from optic sensor, and from light green wire curcuit 984 from PCM to FSD, Have found loss of signal on Red wire curcuit 985 from PCM to Fuel Solenoid Driver, Question is my inf...
1996 Chevrolet Caprice Classic 5.7L No Start VIN: 1G1BL52P6T
veh came in with complaint of no start; found dash light on "pass key fault"; diagnosed and replaced fault ignition switch and keys(standard broken wires at cylinder) went to restart veh and could not faound good spark, injection pulse good; veh had no fuel pr...
1997 Chevrolet Corvette 5.7L sterring wheel rotation sensor VIN: 1G1YY2260V
this particular vehicle had an extensive repair history. the current problem is the "service vehicle soon" error message on the instrument panel. the stored code is c1281 in the anti-lock system, for "uncorrelated steering sensor". after some research, it seem...
1998 Chevrolet Blazer 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNT13W4W2
Truck came in codes PO171, PO131,PO300, PO1870, and running rough. Found bank 1 sensor 1 dead and all plugs on that bank black. Replaced HO2S and did a major tune-up truck ran great. Came back 1 week later HO2 sensor dead again and plugs fouled. Replaced HO2S ... Trouble codes: P0171, P0131, P0300
2000 Chevrolet Astro 4.3L Headlights VIN: 1GCDM19W3Y
Very intermittent headlight operation. This problem has occured three times in the last 2 weeks for the customer. After many test drives it finally did it for us today. When headlights stop working, park lights and dash lights still work. E.brake switch OK, DR...
2001 Chevrolet Malibu 3.1L passkey system VIN: 1G1ND52J21
Hello,I have this malibu{which is my cousins car and they will be at my house for thanksgiving dinner}The car will not start about once a month,very intermittenly,security light will flash when car will not start,then magically the car will start.This has happ...
2001 Chevrolet S10 2.2L engine VIN: 1GCCS14592
has any one had one like this ,anything to zreo in on problem ?engine vibrates all time gives me the impression of out of balance flywheel or converter,engine does not miss, it runs good, I can not detect any engine bearing noise. vib is from 500 to 3000 rpm, ...
2002 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22GX2
hello friends, this vette is a crank but no start, no ignition and no injector pulse, many modules have codes set. we are only getting 3 volts to crank sensor, check wiring from pcm to crank sensor, all data shows should have a 12 volt reference. if we crank a... Trouble codes: U1016, B2860, P0341, P0336
2002 Chevrolet Venture LS 3.4L Speedo, Driver Info Center, Odometer VIN: 1GNDX13E62
Good evening friends, This van was wrecked in the back and had a complete rear clip installed by our customer. The job looks very professional and he tells me all the wire harness is original with the front part of the van. The power sliding door with all rela...
1988 Oldsmobile Toronado Trofeo 3.8L Hesitation, Cuts out, MIL Lamp on VIN: 1G3EV11C4J
Mil on. Code E041 Current. Disconnected cam sensor and measured voltage Pins A&B 5 Volts B&C 9 volts. Tested Voltage at ECM Pin IC5 Key on 0 volts Engine running 11.5 and flucuates. Replaced Ignition module with new delco and now have 11. Volts on ECM pin IC5 ... Trouble codes: E041 (Cam Sensor Circuit)
1993 Pontiac Grand Am SE 3.3L heater core VIN: 1G2NE5PM5P
A good customer of mine just bought a PONTIAC GRAN AM for his daughter and he notice there is no heat, heater core hoses are disconnected and bypassed, plus SES light is on intermittently,I found DTC 26 a driver module error. I should have no problem diagnosin...
1996 Pontiac Grand Am SE 3.1L Hesitation, no power
The car has a bog\hesitation under normal acceleration. At about 1500-2000 rpm it will not continue to accelerate. I find that it happens all the time except when you first start it (first minute or so).If you floor the throttle it will eventually get past tha...
1996 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5279T
Hello saturn techs: I have this 96 SL2 which failed Emissions OBDII test. It came to the shop and I found the missfire codes P0300 and P0303. I found the #3 spark plug tube full of oil. Replaced wires and plugs. When I erased the DTC memory, now the service li... Trouble codes: P0300 (Random missfire), P0303 (Cylinder 3 miss)

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Roadmaster 5.7L ride control VIN: 1G4BR82P13
Due to costs we were forced to install manually adjustable air shocks. The system seemed to malfunction intermittently and could not be duplicated in the shop. Replies said leaking shocks-get out the soapy water and I agree. Thanks to those who tried to help.
1996 Buick Riviera 3.8L temperature control VIN: 1G4GD22I9T
Thank you to everyone who responded. This is apparently a common occurance. If the refridgerant is even a few oz. low then the temperarure out of the front vents can vary significantly. We evacuated and recharged the system and the problem went away. Thanks ag...
2000 Buick LeSabre Custom 3.8L no electric power VIN: 1G4HP54K0Y
this one is fixed thanx to all who replied!!! the fix was the ingnition fuse under the rear seat. turns out the fuse had an intermitent conection problem. you could check it with the test light when the car acted up and all looked good but if you wig...
1992 Chevrolet Lumina Euro 3.4L t-belt VIN: 2G1WN54X9N
Thanks to everyone that wrote. The fix was removing cam sprocket shims so cams would turn. This enigne was a fight all the way to the finish. The directions in the timing belt books are not good enough. We replaced belt, tensioner & pulleys. Do not want this o...
1993 Chevrolet Lumina 3.1L Idle speed on start VIN: 2G1WL54T3P
Thanks to everyone who responded. I checked everything everyone recommended but found the problem to be a leaky injector. Instead of replacing the bad injector, owner requested I replace all six since she plans to run the car to 300k+. Replaced all injectors w...
1996 Chevrolet Corvette 5.7L Operation VIN: 1G1YY22P2T
Although we didn't get many replies, most of you were thinking along the same lines that we were, no back-up power supply or a vacuum leak. Unfortunately, neither one of these was the cause of this particular problem. The break that we needed to diagnose this ...
2000 Chevrolet Malibu 3.1L electric window motor VIN: 1G1ND52J7Y
Thanx for all the replies. It turned out to be a faulty master switch, popped a new one in and it's working fine. Most everyone had the same reply, I don't work very much on electric windows, most all our fleet is the ole fashion crank type. This is a wonderfu...
2001 Chevrolet Silverado 1500 5.3L suspension VIN: 1GCEK14T71
Customer got 'crazy with the vehicle'. He personally replaced the rear driveshaft and replaced rear rotors. The vibration was cured. It would have been nice to see exactly what fixed it. Unfortunately this customer had had enough. I thank all that helped with ...
2004 Chevrolet Silverado 2500 HD 6.0L oil pressure VIN: 1GCHK29UO4
AWSOME, What a group. what a world of knowledge is out there. connnected manual gauge to sender port,could obtain sender so got a sender and broke off top, brazed fitting to sendere and tested oil pressure. oil pressure mirrored what dash gauge was reading. ob...
2005 Chevrolet Silverado 2500 HD 6.0L tires VIN: 1GCHK29U35
Hey everybody! thanks for all input.I installed 265/75 16s without any problems at all,as some of you said.I was waiting for G.Y. silent armours load range E.Can't even notice the difference.plenty of room,could have gone bigger if i wanted.with only 2500 mile...
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